cerc-io/watcher-ts
15
1
Fork 0
mirror of https://github.com/cerc-io/watcher-ts synced 2024-10-02 14:12:38 +00:00
Code Issues Packages Projects Releases Wiki Activity
16bb955213
watcher-ts/packages/graph-test-watcher/README.md
nikugogoi 6cca55a1ab Integrate generated watcher to invoke handlers in graph-node (#33) 
* Invoke handlers based on watcher-ts events

* Read subgraph yaml and listen to events from watcher-ts

* Create GraphWatcher class to use in generated example contract watcher

* Call graph-node event handler from generated watcher
2021-12-28 16:08:05 +05:30

1.9 KiB
Raw Blame History

Example Watcher

Setup

  • Run the following command to install required packages:

    yarn

  • Create a postgres12 database for the watcher:

    sudo su - postgres
createdb graph-test-watcher

  • If the watcher is an active watcher:

    Create database for the job queue and enable the pgcrypto extension on them (https://github.com/timgit/pg-boss/blob/master/docs/usage.md#intro):

    createdb graph-test-watcher-job-queue

    postgres@tesla:~$ psql -U postgres -h localhost graph-test-watcher-job-queue
Password for user postgres:
psql (12.7 (Ubuntu 12.7-1.pgdg18.04+1))
SSL connection (protocol: TLSv1.3, cipher: TLS_AES_256_GCM_SHA384, bits: 256, compression: off)
Type "help" for help.

graph-test-watcher-job-queue=# CREATE EXTENSION pgcrypto;
CREATE EXTENSION
graph-test-watcher-job-queue=# exit

  • Update the config with database connection settings.

  • Update the upstream config in the config file and provide the ipld-eth-server GQL API and the indexer-db postgraphile endpoints.

Customize

  • Indexing on an event:

    • Edit the custom hook function handleEvent (triggered on an event) in hooks.ts to perform corresponding indexing using the Indexer object.

    • Refer to hooks.example.ts for an example hook function for events in an ERC20 contract.

Run

  • Run the watcher:

    yarn server

GQL console: http://localhost:3008/graphql

  • If the watcher is an active watcher:

    • Run the job-runner:

      yarn job-runner

    • To watch a contract:

      yarn watch:contract --address <contract-address> --kind Example --starting-block [block-number]

    • To fill a block range:

      yarn fill --startBlock <from-block> --endBlock <to-block>